  .user-select(@string: none) {
    -moz-user-select: @string;
    -webkit-user-select: @string;
    -ms-user-select: @string;
  }
  .text-shadow (@string: 0 1px 3px rgba(0, 0, 0, 0.25)) {
    text-shadow: @string;
  }
  .box-shadow (@string) {
    -webkit-box-shadow: @string;
    -moz-box-shadow:    @string;
    box-shadow:         @string;
  }
  .drop-shadow (@x: 0, @y: 1px, @blur: 2px, @spread: 0, @alpha: 0.25) {
    -webkit-box-shadow:	@x @y @blur @spread rgba(0, 0, 0, @alpha);
    -moz-box-shadow:	@x @y @blur @spread rgba(0, 0, 0, @alpha);
    box-shadow:		@x @y @blur @spread rgba(0, 0, 0, @alpha);
  }
  .inner-shadow (@x: 0, @y: 1px, @blur: 2px, @spread: 0, @alpha: 0.25) {
    -webkit-box-shadow: inset @x @y @blur @spread rgba(0, 0, 0, @alpha);
    -moz-box-shadow:    inset @x @y @blur @spread rgba(0, 0, 0, @alpha);
    box-shadow:         inset @x @y @blur @spread rgba(0, 0, 0, @alpha);
  }

  .box-sizing (@type: border-box) {
    -webkit-box-sizing: @type;
    -moz-box-sizing:    @type;
    box-sizing:         @type;
  }

  .border-radius (@radius: 5px) {
    -webkit-border-radius: @radius;
    -moz-border-radius:    @radius;
    border-radius:         @radius;

    -moz-background-clip:    padding;
    -webkit-background-clip: padding-box;
    background-clip:         padding-box;
  }
  .border-radiuses (@topright: 0, @bottomright: 0, @bottomleft: 0, @topleft: 0) {
    -webkit-border-top-right-radius:    @topright;
    -webkit-border-bottom-right-radius: @bottomright;
    -webkit-border-bottom-left-radius:  @bottomleft;
    -webkit-border-top-left-radius:     @topleft;

    -moz-border-radius-topright:        @topright;
    -moz-border-radius-bottomright:     @bottomright;
    -moz-border-radius-bottomleft:      @bottomleft;
    -moz-border-radius-topleft:         @topleft;

    border-top-right-radius:            @topright;
    border-bottom-right-radius:         @bottomright;
    border-bottom-left-radius:          @bottomleft;
    border-top-left-radius:             @topleft;

    -moz-background-clip:    padding;
    -webkit-background-clip: padding-box;
    background-clip:         padding-box;
  }

  .opacity (@opacity: 0.5) {
    -webkit-opacity: 	@opacity;
    -moz-opacity: 		@opacity;
    opacity: 		@opacity;
  }

  .gradient-btn(@startColor: #6e6e6e, @endColor: #000000) {
    background: @startColor;
    background: -webkit-gradient(linear,left bottom,left top,color-stop(0.5, @startColor),color-stop(0.5, @endColor));
    background: -moz-linear-gradient(@endColor 50%,@startColor 50%);
    background: -ms-linear-gradient(@endColor 50%,@startColor 50%);
    background: -o-linear-gradient(@endColor 50%,@startColor 50%);
  }

  .gradient (@startColor: #eee, @endColor: white) {
    background-color: @startColor;
    background: -webkit-gradient(linear, left top, left bottom, from(@startColor), to(@endColor));
    background: -webkit-linear-gradient(top, @startColor, @endColor);
    background: -moz-linear-gradient(top, @startColor, @endColor);
    background: -ms-linear-gradient(top, @startColor, @endColor);
    background: -o-linear-gradient(top, @startColor, @endColor);
  }
  .horizontal-gradient (@startColor: #eee, @endColor: white) {
    background-color: @startColor;
    background-image: -webkit-gradient(linear, left top, right top, from(@startColor), to(@endColor));
    background-image: -webkit-linear-gradient(left, @startColor, @endColor);
    background-image: -moz-linear-gradient(left, @startColor, @endColor);
    background-image: -ms-linear-gradient(left, @startColor, @endColor);
    background-image: -o-linear-gradient(left, @startColor, @endColor);
  }

  .animation (@name, @duration: 300ms, @delay: 0, @ease: ease) {
    -webkit-animation: @name @duration @delay @ease;
    -moz-animation:    @name @duration @delay @ease;
    -ms-animation:     @name @duration @delay @ease;
  }

  .transition (@transition) {
    -webkit-transition: @transition;
    -moz-transition:    @transition;
    -ms-transition:     @transition;
    -o-transition:      @transition;
  }
  .transform(@string){
    -webkit-transform: @string;
    -moz-transform: 	 @string;
    -ms-transform: 		 @string;
    -o-transform: 		 @string;
  }
  .scale (@factor) {
    -webkit-transform: scale(@factor);
    -moz-transform: 	 scale(@factor);
    -ms-transform: 		 scale(@factor);
    -o-transform: 		 scale(@factor);
  }
  .rotate (@deg) {
    -webkit-transform: rotate(@deg);
    -moz-transform: 	 rotate(@deg);
    -ms-transform: 		 rotate(@deg);
    -o-transform: 		 rotate(@deg);
  }
  .skew (@deg, @deg2) {
    -webkit-transform:       skew(@deg, @deg2);
    -moz-transform: 	 skew(@deg, @deg2);
    -ms-transform: 		 skew(@deg, @deg2);
    -o-transform: 		 skew(@deg, @deg2);
  }
  .translate (@x, @y:0) {
    -webkit-transform:       translate(@x, @y);
    -moz-transform: 	 translate(@x, @y);
    -ms-transform: 		 translate(@x, @y);
    -o-transform: 		 translate(@x, @y);
  }
  .translate3d (@x, @y: 0, @z: 0) {
    -webkit-transform:       translate3d(@x, @y, @z);
    -moz-transform: 	 translate3d(@x, @y, @z);
    -ms-transform: 		 translate3d(@x, @y, @z);
    -o-transform: 		 translate3d(@x, @y, @z);
  }
  .perspective (@value: 1000) {
    -webkit-perspective: 	@value;
    -moz-perspective: 	@value;
    -ms-perspective: 	@value;
    perspective: 		@value;
  }
  .transform-origin (@x:center, @y:center) {
    -webkit-transform-origin: @x @y;
    -moz-transform-origin:    @x @y;
    -ms-transform-origin:     @x @y;
    -o-transform-origin:      @x @y;
  }